Those are standard date and time format specifiers You do not need to translate those format specifiers, though you could change them if the default format specifiers are less common for your language region. Here's an interactive page where you can enter the format string and see what it looks like: http://www.foragoodstrftime.com/

You can look up the format specifiers in the strftime manpage if you want, with the command `man strftime` on your terminal or online here: http://linux.die.net/man/3/strftime.